Drop hammer



Sept. 25, 1923; 1,468,953

J. R. BLAKESLEE DROP HAMMER Filed March 14 1921 3 Sheets-Sheet 1 John E.B/mcs /ee sepiz. 25,1923. 1,468,953

J. R. BLAKESLEE DROP HAMMER Filed March 14 .1921 s Sheets-Sheet 2 J. R.BLAKESLEE DROP HAMMER Filed March 14 1921 5 Sheets-Sheet 5 6 c Y %#%E T6N NM 2 fi/ w M 7 E U fw 7 7 8 Sept. 25, 1923.

JOHN B. BLAKESLEE, OF CLEVELAND, OHIO, ASSIGNOR TO THE AJAX MANUFACTUR-ING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

DROP finmmna.

Application filed March 14, 1921.

To all whom it may concern:

Be it known that I. JOHN R. BLAKESLEE, a citizen of the United States,and a resident of Cleveland, county of Cuyahoga, and State of Ohio, haveinvented a new and useful Improvement in Drop Hammers, of which thefollowing is a specification, the principle of the invention beingherein explained and the best mode in which I have contemplated applyingthat principle, so as to distinguish it from other inventions.

The present improvements, relating, as indicated, to drop hammers, havemore particular regard -to an improved driving mechanism for suchhammers whereby the use of belts or other flexible driving connectionsis done away with. My improved driving mechanism is particularly adaptedfor use with an electric motoras the source of ower.

o the accomplish. ;rent of the foregoing and related ends, saidinvention, then, consists of the means hereinafter fully described andparticularly pointed out in the claims, the annexed drawings and thefollowing description setting forth in detail certain mechanismembodying the invention, such disclosed means constituting, however, butone of various mechanical forms in which the principle of the inventionmay be used.

In said annexed drawings Fig. 1 is a front elevation of a drop hammerembodying my improved drive mechanism; Fig. 2 is a side elevationthereof as viewed from the left in Fig. 1; and Fig. 3 is a plan.

The general features of construction, so far as illustrated in thedrawings, will be recognized as familiar. These include, in other words,the weighted hammer holder 1 that is slidably held between verticaluides 2 formed integral with the frame 3.

ttached to said holder 1 is the board 4 that extends upwardly betweenthe two lifting rollers or spoolers 5. It is to the mounting of thelatter, and the mechanism provided for rotating same in proper directionto lift the board 4 and attached hammer holder 1 that attention isdesired.

Said rollers 5 are keyed or otherwise nonrotatably mounted on spindles 6journaled in the lower ends of frames 7 that depend from shafts 8mounted in upwardly extending portions 9 of frame 3 so as to lie onopposite sides of the board 4 and in parallel relation Serial No.451,935.

thereto. These frames are accordingly free to be swung or oscillatedabout shafts 8 as axes so as to move the rollers 5 into or out ofcontact with the board 4 as desired. Such movement or adjustment of theframes is effected through the medium of two rock shafts 10, one foreach frame journaled in the main frame of the machine, each such rockshaft having eccentrics 11 on its respective ends that are connectedwith the corresponding frame 7 through the medium of links 12. Each rockshaft furthermore is provided with an outwardly projecting lever or arm13, to the free end of which is attached the upper end of rod 14 in theone case, and a similar rod 15 in the other. Rod 14 has its lower endthreaded and provided with adjusting nuts 16 whereby the roller 5operated thereby may be set in predetermined position, this roller beingadjusted only to take up wear. In conjunction with the other rod 15,however, there is provided the usual latch 17 and trip 18, (not shown indetail) whereby the rollbr corresponding with said rod is normallypressed against the board 4, but is released when the upper limit of thehammer stroke is reached.

For driving the rollers or spoolers 5, gears 20 are mounted on theopposite ends of each spindle 6 that mesh with pinions 21 on thecorresponding shafts 8. A tubular housing 22 is provided at therespective ends of frame 7 to enclose such gears 20 and pinions 21.Mounted in turn on corresponding ends of shafts 8, which project for thepurpose a short distance beyond main frame extensions 9, areintermeshing gears 23 where by it will be seen the spindles 6 areinterconnected so that rotation thereof will be in opposite directions,while at the same time said spindles are free to be swung apart fromeach other, as by oscillation of the frames 7 or either of the latter.For the purpose of thus driving the spindles 6 power is preferablyderived from anelectric motor 24 supported on a suitable bracket 25, andhaving a pinion 26 on the spindle that meshes with one of the aforesaidgears 23. It v '11 be understood of course that power derived from anysuitable source may be applied to either of the shafts 8 withoutdeparting from the spirit of my invention.

The arrangement, however, just described provides a simple and compactform of drive whereby an electric motor may be used to operate a drophammer of the type in question, which. so far as I am aware, has neverheretofore been accomplished satisfactorily despite the obviousdesirability of employing individualmotor drives for such machines.

Other modes of applying the principle of my invention may be employedinstead of the one explained, change being made as regards the mechanismherein disclosed, provided the means stated by any of the followingclaims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as myinvention 1. In a drop-hammer, the combination of a verticallyreciprooable board; frames oscillatory about axes on the respectivesides of said board and parallel therewith; rollers carried by saidframes adapted upon inward movement thereof to contact with said board;and gearing for driving said rollers including an intermeshing gear andpinion respectively coaxial with each roller and the pivotal axis of thecorresponding frame, and means for driving said pinions in oppositedirections.

2. In a drop-hammer, the combination of a vertically reciprocable board;frames oscillatory about axes on the respective sides of said board andparallel therewith; rollers carried by said frames adapted upon inwardmovement thereof to contact with said board; and gearing for drivingsaid rollers including an intermeshing gear and pinion respeotivelycoaxial with each roller and the pivotal axis-of the correspondingframe, and two intermeshing gears connected with said pinionsrespectively.

3. In a drop-hammer, the combination of a messes vertically reciprocableboard; two shafts rotatably mounted on opposite sides and parallel withsaid board; a frame oscillatorily mounted on each of said shafts; aroller carried by each frame and adapted upon inward movement of thelatter to contact with said board; a ear coaxial with each roller; apinion on t e corresponding shaft inter-connected with such gear; andtwo intermeshing gears mounted on said shafts respectively.

4. In a drop-hammer, the combination of a vertically reciprocable board;two shafts rotatably mounted on opposite sides and parallel with saidboard; a frame oscillatorily mounted on each of said shafts; a rollercarried by each frame and adapted upon inward movement of the latter tocontact with said board; a car coaxial with each roller; a pin ion on te corresponding shaft inter-connected with such gear; two intermeshinggears mounted on said shafts, respectively; and a motor arranged to'directly drive one of said last-named gears.

5. In a drop-hammer, the combination of a vertically reciprocable board;two shafts rotatably mounted on opposite sides and parallel with saidboard; a frame oscillatoril mounted on each of said shafts; a shaft witha roller thereon carried by each frame and adapted upon movement of thelatter to contact with said board; a ear on one end of one roller-shaftand a similar gear on the opposite end of the other such shaft; pinionson the corresponding ends of the corresponding frame-shafts meshing withsaid gea.rs,

respectively; and two intermeshing gears mounted on said res ectiveframe-shafts.

Signed by me, t is 12th day of March,

JOHN R BLAKESLEE;

